<!DOCTYPE html>
<html>
<head>
<style>
div {
	color: red;
}
</style>
<script src="jquery.js"></script>
<script>
	$(document).ready(function(){
		$("#role").change(function () {	
      var str = "";
      $("#role option:selected").each(function () {
            //str += this.value+ " ";
            if(this.value==-1)
            	alert(this.value)
          });
      $("#msg").text(str);
    });    
	});
	
</script>
</head>
<body>

	<select id="role">

		<option>Flowers</option>
		<option value="-1">Shrubs</option>
		<option value="2">Trees</option>
		<option value="3">Bushes</option>

		<option value="4">Grass</option>
		<option value="5">Dirt</option>
	</select>
	<div id="msg"></div>


</body>
</html>